Equivalent dipole model optimized by Ant Colony Optimization Algorithm for modeling antennas in their context

Abstract

The objective of the proposed method is to model embedded emitting antennas placed on a large dimension platform (vehicle, boat,,..). In the proposed approach, the complex far field radiation pattern of the alone antenna is supposed to be known in three dimensional space. Then a model of the antenna constituted by a distribution of elementary electrical dipoles is built and optimized. For such a model, the constraint is to have the same radiation pattern as the original antenna in all the directions. The optimization is made by an extended Ant Colony Optimization (ACO) algorithm. The model is meshless, i.e., it can be integrated in a fullwave method without the need to conform to the meshing which will be therefore dedicated to the carrier modeling. Finite Difference Time Domain (FDTD) method is used to evaluate the dipolar model and its integration with a carrier. Hence, one main interest of such an approach is to derive a model of the antenna decorrelated of the Cartesian grid. The powerful of the approach will be shown on a simple example.